Asst. Professor Dr. Najla Hisham Tahir delivered a lecture entitled ( Food Poisoning and Chemical elements ). She tackled that the nature of the professions practiced by a person and the nature of his work which might expose him/her to pollution either noisy or chemical or food . There is a type of poisoning caused by chemical elements such as lead , mercury , cadmium , manganese , carbon dioxide , by their presence and their spread .Also , there are precautions against different forms of poisoning.